<template>
  <el-container class="home_container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/logo.jpg" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="primary" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px'">
        <!-- 侧边栏菜单区域 -->
        <div class="button-toggle" @click="toggleCollapse">|||</div>
        <el-menu
          background-color="#333844"
          text-color="#fff"
          active-text-color="#367ecf"
          unique-opened
          :collapse='isCollapse'
          :collapse-transition='false'
          router
          :default-active='activePath'
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item @click="saveNavState('/'+subItem.path)" :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" >
              <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
            </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧主体 -->
      <el-main>
        <!-- 欢迎界面 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist:[],
      // 左侧菜单栏字体图标
      iconsObj:{
        '125':'iconfont icon-user',
        '103':'iconfont icon-quanxian',
        '101':'iconfont icon-shangpinguanli',
        '102':'iconfont icon-dingdan',
        '145':'iconfont icon-shuju',
      },
      // 是否折叠
      isCollapse:false,
      // 被激活的链接地址
      activePath:''
    }
  },
  // 定义生命周期函数
  created(){
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList(){
      const {data:res} = await this.$http.get('menus')
      if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res);
    },
    // 点击按钮切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态 
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath
    }
  },
}
</script>
<style lang="less" scoped>
.home_container {
  height: 100%;
}
.el-header {
  background-color: #363d3f;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    img {
      width: 50px;
      height: 50px;
      border-radius: 50%;
    }
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333844;
    .el-menu{
    border-right: none;
  }
}
.el-main {
  background-color: #e6eaec;
}
.iconfont{
  margin-right: 10px;
}
.button-toggle{
  background-color: #464f60;
  text-align: center;
  color: #fff;
  font-size: 10px;
  letter-spacing: .3em;
  line-height: 24px;
  cursor: pointer;
}
</style>